BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Mountain Chickadee In Coastal California

All regionsCoastal CaliforniaForest birds

Mountain Chickadee in Coastal California has collapsed: down 77% on the route-weighted index since 1971.

-77%Since 1971
38Routes In Region
55Years

Notable Signals

long arc declinecomputed index

Mountain Chickadee has collapsed in Coastal California: down 77% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Mountain Chickadee in Coastal California is projected to rise about 106% by 2029 — from 0.94 in 2024 to a central estimate of 1.9 (95% range 0.00–4.8). A 5-year backtest shows a typical error of ±61.2%, with 100% of held-out values landing inside the 95% band.

+106%Change by 2029
1.9Projected 2029 index
0.00–4.895% range
±61.2%Backtest error
19692029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20252.10.004.9
20262.00.004.9
20272.00.004.8
20282.00.004.8
20291.90.004.8

Routes In Coastal California

Routes recording Mountain Chickadee in Coastal California.
ValyermoCALIFORNIA652019
Mt LagunaCALIFORNIA381987
WoodlandsCALIFORNIA312024
Lake HemetCALIFORNIA291986
Big BearCALIFORNIA281986
FallsvaleCALIFORNIA281981
Angelus OaksCALIFORNIA212017
Yolla BollyCALIFORNIA191973
Mt PinosCALIFORNIA172004
Green ValleyCALIFORNIA132023
Sawmill MtnCALIFORNIA82013
Cleveland NfCALIFORNIA82018
StonyfordCALIFORNIA82018
White RiverCALIFORNIA71992
Lake Hemet 2CALIFORNIA62023
CohassetCALIFORNIA52024
Anza 2CALIFORNIA52024
Hough SpringsCALIFORNIA52007
Lockwood ValCALIFORNIA32018
Cuyamaca PkCALIFORNIA32023
Elizabeth LkCALIFORNIA32016
Cleveland Nf 2CALIFORNIA32022
Mt BaldyCALIFORNIA22024
Lake CachumaCALIFORNIA21987
TehamaCALIFORNIA22019

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.